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    <p>The main issue is some PerformanceCounter properties such as CategoryName are marked with the <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.readonlyattribute.aspx" rel="nofollow">ReadOnly</a> attribute. When the property grid sees a ReadOnly attribute on a property, you can't edit it, so you can' have the drop down with the list of category names.</p> <p>I don't know how what magic the designer uses to overcome this, but here is my solution. We add a custom <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.typedescriptionprovider.aspx" rel="nofollow">TypeDescriptionProvider</a> to the instance of PerformanceCounter edited, and provide a custom type descriptor that removes the ReadOnly limitation.</p> <p>This is how you can use it (with a propertyGrid1 instance of the PropertyGrid class):</p> <pre><code>PerformanceCounter counter = new PerformanceCounter(); // use a custom type description provider for this counter TypeDescriptor.AddProvider(new PerformanceCounterTypeProvider(), counter); // filter unwanted properties propertyGrid1.BrowsableAttributes = new AttributeCollection(DesignerSerializationVisibilityAttribute.Visible); // select it in the property grid propertyGrid1.SelectedObject = counter; </code></pre> <p>And this is the utility code used:</p> <pre><code>public class PerformanceCounterTypeProvider : TypeDescriptionProvider { private static PropertyDescriptor[] _properties; static PerformanceCounterTypeProvider() { List &lt; PropertyDescriptor&gt; properties = new List&lt;PropertyDescriptor&gt;(); foreach (PropertyDescriptor pd in TypeDescriptor.GetProperties(typeof(PerformanceCounter))) { PerformanceCounterPropertyDescriptor clone = new PerformanceCounterPropertyDescriptor(pd); properties.Add(clone); } _properties = properties.ToArray(); } public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance) { return new PerformanceCounterTypeDescriptor(); } private class PerformanceCounterTypeDescriptor : CustomTypeDescriptor { public override PropertyDescriptorCollection GetProperties(Attribute[] attributes) { return new PropertyDescriptorCollection(PerformanceCounterTypeProvider._properties.ToArray()); } } private class PerformanceCounterPropertyDescriptor : PropertyDescriptor { private PropertyDescriptor _desc; public PerformanceCounterPropertyDescriptor(PropertyDescriptor desc) : base(desc, new List&lt;Attribute&gt;(desc.Attributes.OfType&lt;Attribute&gt;()).ToArray()) { _desc = desc; } public override void SetValue(object component, object value) { // we can't use _desc.SetValue because the underlying property descriptor checks it's read only ComponentType.GetProperty(Name).SetValue(component, value, null); } public override bool IsReadOnly { get { return false; } } public override bool CanResetValue(object component) { return _desc.CanResetValue(component); } public override Type ComponentType { get { return _desc.ComponentType; } } public override object GetValue(object component) { return _desc.GetValue(component); } public override Type PropertyType { get { return _desc.PropertyType; } } public override void ResetValue(object component) { _desc.ResetValue(component); } public override bool ShouldSerializeValue(object component) { return _desc.ShouldSerializeValue(component); } } } </code></pre>
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    1. POSetting up PerformanceCounter with PropertyGrid
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    1. USSimon Mourier
    1. USSimon Mourier
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      1. VTUpMod
    1. COThanks, I checked it and the `GetValue` routine throws that category name is missing. Could you please check it?
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      1. USPho3nixHun
 

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